English: Depiction of vergence & focus when viewing autostereograms, as if from above. Normal vergence: both eyes focused on the same object at the distance the object is from the viewer (slightly different distances from each eye) (eyes neither crossed nor the opposite). Focus and vergence are aligned.
The empty circle is one's head, the black circles are one's eyes, the dashed line is the pattern on the page, and the solid lines are one's lines of sight (vergence). The arrow indicates one's accommodation.
See: Stephen M. Kosslyn, Daniel N. Osherson (1995). An Invitation to Cognitive Science, 2nd Edition - Vol. 2: Visual Cognition, p.65 fig. 1.49. ISBN9780262150422.
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